Technical Summary: 4028 BCD-to-Decimal Decoder

Overview

The 4028 is a monolithic integrated circuit designed for BCD-to-decimal decoding or binary-to-octal decoding applications. It is part of the 4000 series CMOS logic family, known for its low power consumption and high noise immunity. The 4028 features high decoded output drive capability and operates with positive logic inputs and outputs, making it suitable for a variety of digital systems.

This decoder is widely used in applications requiring the conversion of binary-coded decimal (BCD) inputs into one of ten mutually exclusive outputs. Its robust design ensures reliable performance in both industrial and consumer electronics.

Features

• BCD-to-Decimal Decoding: Converts 4-bit BCD input into one of ten decimal outputs.
• Binary-to-Octal Decoding: Can also function as a 3-bit binary-to-octal decoder.
• High Output Drive Capability: Capable of driving high capacitive or low impedance loads.
• Positive Logic Operation: Inputs and outputs are active high, simplifying interface with other logic families.
• Wide Supply Voltage Range: Operates from 3V to 15V, making it versatile for various applications.
• Low Power Consumption: Typical of CMOS technology, ensuring energy efficiency.
• High Noise Immunity: Robust against electrical noise in industrial environments.

Applications

The 4028 decoder is used in a variety of digital and embedded systems, including:

• Digital Displays: Drives 7-segment displays or other indicator systems in calculators, clocks, and meters.
• Data Routing: Selects one of multiple output lines based on BCD input, useful in multiplexing applications.
• Control Systems: Decodes control signals in automation and industrial equipment.
• Address Decoding: Used in memory systems to select specific memory locations based on address inputs.
• Instrumentation: Interfaces with sensors and other digital measurement devices.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_DD): -0.5V to +18V
• Input Voltage (V_IN): -0.5V to V_DD + 0.5V
• Output Voltage (V_OUT): -0.5V to V_DD + 0.5V
• Operating Temperature Range: -55°C to +125°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_DD): 3V to 15V
• Input High Voltage (V_IH): 70% of V_DD
• Input Low Voltage (V_IL): 30% of V_DD
• Output Current (I_OUT): ±2.5mA (max) at V_DD = 5V

DC Electrical Characteristics

• Quiescent Current (I_DD): 1µA (max) at V_DD = 10V
• Input Leakage Current (I_IN): ±0.1µA (max) at V_DD = 18V
• Output High Voltage (V_OH): V_DD - 0.05V (min) at I_OUT = -0.4mA
• Output Low Voltage (V_OL): 0.05V (max) at I_OUT = 0.4mA

AC Electrical Characteristics

• Propagation Delay (t_PD): 60ns (typ) at V_DD = 10V, C_L = 50pF
• Transition Time (t_TLH, t_THL): 40ns (typ) at V_DD = 10V, C_L = 50pF
• Power Dissipation (P_D): 10mW (max) at V_DD = 10V

Package Information

The 4028 is available in multiple package options to suit different assembly and space requirements. Below are the common package details:

DIP-16 (Dual In-line Package)

• Package Type: 16-pin plastic dual in-line package (PDIP)
• Dimensions: 19.3mm x 6.35mm (body)
• Pin Pitch: 2.54mm (standard)
• Lead Material: Tin-plated copper
• Operating Temperature: -55°C to +125°C

SOIC-16 (Small Outline Integrated Circuit)

• Package Type: 16-pin small outline IC (SOIC)
• Dimensions: 10.3mm x 5.3mm (body)
• Pin Pitch: 1.27mm
• Lead Material: Matte tin (RoHS compliant)
• Operating Temperature: -40°C to +85°C

TSSOP-16 (Thin Shrink Small Outline Package)

• Package Type: 16-pin thin shrink small outline package (TSSOP)
• Dimensions: 5mm x 4.4mm (body)
• Pin Pitch: 0.65mm
• Lead Material: Lead-free (RoHS compliant)
• Operating Temperature: -40°C to +125°C

Conclusion

The 4028 BCD-to-decimal decoder is a versatile and reliable component for digital systems requiring precise decoding of binary inputs. Its high drive capability, wide voltage range, and robust design make it suitable for a broad spectrum of applications, from consumer electronics to industrial automation. Available in multiple package options, the 4028 offers flexibility for various design requirements while maintaining the low power consumption and high noise immunity characteristic of CMOS technology.